AFP/Getty Images Headquarters of the Organization of the Petroleum Exporting Countries in ViennaOPEC members and their oil-producing allies are widely expected to extend the pact limiting crude-oil production beyond its March expiration date when they meet on Thursday, but there’s still no clear consensus on when the agreement should come to an end. “Russia has yet to endorse [Saudi Arabia’s] proposal for a nine-month extension,” said analysts at Goldman Sachs, led by Damien Courvalin, in a note to clients this week. “We believe the absence of such consensus is due both to the uncertainty on the progress of the oil market rebalancing as well as Brent oil prices trading at $63” a barrel. Strength in oil, which notched 28-month highs earlier this month before tapping one-week lows on Tuesday, and growing U.S. crude output, could give members of the Organization of the Petroleum Exporting Countries a reason to think twice when they decide exactly when to mark the end of the pact.via